Windows (Android Build Target) Packager Fails with mscorlib error

Development Platform & Builds Mobile
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13

Sean,

I ran AVG registry cleaner, rebooted and attempted to package (same failure.)
I uninstalled my .Net frameworks and reinstalled, rebooted (required) and attempted to package (same failure.)

The error message as follows:

MainFrameActions: Packaging (Android (ETC1)): BuildCommand.Execute: ERROR: BUILD FAILED
MainFrameActions: Packaging (Android (ETC1)): Program.Main: ERROR: AutomationTool terminated with exception:
MainFrameActions: Packaging (Android (ETC1)): Program.Main: ERROR: Exception in mscorlib: Input string was not in a correct format.
MainFrameActions: Packaging (Android (ETC1)): Stacktrace:    at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
MainFrameActions: Packaging (Android (ETC1)):    at System.Number.
MainFrameActions: Packaging (Android (ETC1)): ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
MainFrameActions: Packaging (Android (ETC1)):    at UnrealBuildTool.AndroidToolChain.GetLargestApiLevel(String[] ApiLevels)